Enamel for enameling articles in sheet metal or cast metal



CHARLES MUSIOL, OF BRUSSELS, BELGIUM.

ENAMEL EoEENAJuELING ARTICLES IN SHEET METAL on cns'r METAL.

1,332,058. No Drawing To all whom it may con cm:

Be' it known that 1, CHARLES ,MUSIOL,

v engineer, 16 Rue de la Bigorne, Brussels,

Belgium, have invented certain newand useful Improvements in Enamel "for Enameling Articles in Sheet Metal or Cast Metal; and I do hereby declare the following to be a full, clear, and exact description of the invention, suchas willenable others skilled in the art towhich it appertains to make and use the same.

' The foundation coatings heretofore in use, as well as shining or bright and colored glazings used for enameling articles of sheet metal or cast metal are composed of mixtures of silicates, fluorates and borates, to which are added coloring materials such as metallic oxids. Borax or compounds of boron are always necessary when producing 'enamels'from the hereinbefore mentioned, ingredients. The enamels obtained in this manufacture always include boron. By the addition of boric acid the enamels fuse easily and adapt themselves to the eventualexpansions of the enameled metals, but these results are obtained by the sacrifice of duration of the enamels.

Heretofore, enamels were at disposal other-than borosilicated glasses, which are easily fusible. The glazings comprising lead'are the only exceptions, but owing to the poisonousquality of the lead, they are unsuited for several uses, for instance kitchen utensils.

Specification of Letters Patent.

Patented Feb. 24, 1020.

Application filed June 12, 1919. Serial No. 303,796.

The net cost of all enamels in practical use is regulated by the quantity and the price of the compounds of boron therein contained, :and the result of this is that thirty-five to fifty-five per cent. and even seventy-five per cent. of thetotal value of the fused enamels are represented by the quantity of borax used.

According to the present invention it is possible to provide valuable enamels which are independent ofv the compounds of boron, such compounds not being used in the manufacture of these enamels. For the production of these enamels without boron, the following are used: feldspar, fluorid of sodium, fluorid of aluminum, fluor'sp'ar, calcareous spar, silico-fluorid of sodium, kaolin v or chine-clay, 'cryolite, magnesia, potash, quartz, sand, saltpeter, soda, alumina, as well as the known opacifiers, metallic oxids and coloring matters. In the manufacture of these enamels no use is made of milkglass or opal glass, nor of products containing lead or arsenic, nor of compounds of boron. ,The quantities of the various materials in the mixing for the manufacture of these enamels-without boron are chosen according to the required qualities of the enameled articles; fusibility, resistance, hardness, stalbility, resistance to acids, opacity, color, etc.

For a whole series of enamels use is madeof, combinations of substances which are mixed as indicated in the following list:

Roughmiziure.

v Enamel, 7 Chemicals. White. bright Colored.

' g i From To From To From To Silicate (triple; of alumina, soda and lime, Saltpeter 1.0 6.5 1.0 6.5 1.0 6.5 mixed wit uoridsw Soda 15 28 15 28 15 28 Quartz, sand, or flint 15 35 15 35 15 35 Feldspar... 1s 40 1s 40 18 40 Kaolm or clay 0 8 0 3 0 5 Fluors a1 1.5 15 1. 5 15 1.5 15 Silicouorid of sodium 0 15 0 0 0 15,

o e 0 1s 0 0 0 15 I Chiolite 0 15 0 0 0 15 Oxid of antimony 0 6 0 1 0 5 e 0 10 0 0 0 0 Magnesia 0 2 0 1 0 1 Y Color oxid such as: ox ld of cobalt oxid of I 0 0 0 0 0 8 e v nicke oxid of manganese, oxidof c tome. Mill addition in mentageof the weight of Clay .J 4 8 4 8 4 8 melted rough White colorinlg products such as: cxld of tin, 0 10 0 0 0 0 substitutes or oxld of tin, etc. Col matters 0 0 0 0 0 30 g The basis or support of the new enamel and lime, fusing eesil mixed with fluoride I v without boron is an aluminum silicate, soda. v Owing to the .fact t at the raw limits given hereinafter, for obtaining useful enamels:

Elements. From Na O 10 v% to 20% K20 1.5% 5% 'GaO 1.5% 6% MgO 0 1% A1 0 5 10% sio 50 65% Fl, 1. 51% 10% sb o, 0 7 2----.--

The white color is obtained, as heretofore, by means of known white coloring-materials and the various colorations. are obtained by means of metallic oxids and known coloring-matters.

The materials that are necessary for the mixing are weighed carefully, according to the quantities that have been found-suitable for the various sorts of enamels, mixed by hand or mechanically and melted together in the melting furnace. The melted mixture is then tired into water and ground in wet state together with the mill addition, previously carefully weighed. The enamels thus obtained are. further mixed, if necessary, with carbonate of ammonia, after which they are ready for the application on the articles to be enameled. The heating of the articles is effected according to their I purpose, thickness of walls, composition, etc,

tensilestrength and considerable elasticity,

and surpasses enamels containing boron by its resistance tothe action of liquids and of acids of fruits, etc. What I claim is:

1. An enamel without boron for enameling articles of sheet metal or cast metal, the basis or support of which is a triple silicate of aluminium, sodium and calcium, mixed with .fiuorids.

2. .An enamel without boron for enameling articles of sheet metal or cast metal, the basis or support of which is a triple silicate of aluminium, sodium and calcium, mixed with fluorids and opacified. p

3. An enamel without boron for enameling articles of sheet metal or cast metal, the basis or support of which is a triple silicate of aluminium, sodium and calcium mixed with fluorids and colored by meansof color; ing materials.

In testimony whereof I afiix my signature in presence oftwo witnesses.

I CHARLES MUSIOL. Witnesses:

EUGENE DEYoN,

CHARLES MERoHm. 

